Griffco M-Series Pressure Relief Valves

griffco m-series, pressure relief valves, diaphragm pressure valves, griffco

Griffco M-Series diaphragm back pressure valves are designed to protect chemical feed systems from over pressure damage caused by defective equipment or a blockage in the chemical feed line. Robust construction ensures reliability in the rigorous service of municipal and industrial applications.

Wetted Materials:

  • PVC

  • CPVC

  • PP

  • PVDF

  • PTFE

  • Halar®

  • 316 SS

  • Alloy 20

  • Hastelloy®C

Available Sizes:

1/4" to 1/2" or DN 8 to DN 15

Features & Benefits:

  • High reliability at a low cost

  • 2-port, 3-port, and 90º configurations

  • Solid, robust, machined construction

  • Wide range of materials

  • Union, threaded and socket connection options

  • Molded Noryl top with integral hardware locking

  • 316L metal valve and top options

  • Molded PTFE/EPDM diaphragm

  • Multiple diaphragm material options

  • Long diaphragm life

  • Adjustable up to 350 psi (24 bar)

  • 4 optional pressure ratings (springs)

  • Valve sizes from 1/4" to 1/2" or DN 8 to DN 15

  • Tamper-resistant adjustment screw

  • High-temperature option up to 300ºF (149ºC)

  • Factory or field settable

Download Technical Data Sheet: Imperial (US) | Metric (International)

Sizes, Flow Capacities & Pressure Ratings
Size Maximum Flow Maximum Pressure
Pulsating Continuous
1/4" DN 8 100 375 5 19 350 24
3/8" DN 10 200 757 10 37 350 24
1/2" DN 15 260 984 15 57 350 24


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